The part number changes about every 24-36 months. Take a old line to NAPA and they have a big book with pictures and specs and they can figure it out. Unless your truck is the same year as the one they listed the PT# for there is no garantee it will be the correct one. It seems that the big pt# that gets passed around is 82-85. I can tell you this doesn't resemble the one on a 79 and a 75 and the 75 is different than the 79.

Someone was saying Napa is Dana, they don't change there part # that offten do they.
Is your Napa carrying oil seals manufactured by Victor ?
Is your Napa carrying u-joints that are manufactured by Spicer ?
Thanks alot

Well I don't know about them "being Dana" but they do sell Dana Spicer seals and parts. Thats the only place I will buy axle and case seals because they still have the good USA made seals. They to are getting cheap and even some of the stuff packaged in Dana packing is the cheap China / Japan junk. Try to avoid those when buying seals. Be sure to check the parts for the USA label.

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